Territory



(No Model.)

J. L. GIROUX.

ORE ROASTING FURNACE.

N0. l58,'769= Patented June 9,1891.

ilrrirnn l arnnr rerun,

JOSEPH L. GIROUX, O'F JEROME, ARIZONA TERRITORY.

JFlE=ROIhSTlNG FURNACE.

SFECIFIGATIGN forming part of Letters Patent No. 453,769, dated June 9, 1891.

Application. filed April 9, 1890.

Serial No. 347,243. (No model.)

'tion of the sainc. I

My in veniion relates to an improvement in ore-roasting furnaces; and its object is to precipitate and automaticall return the lighter dust particles/into the furnace and prevent their being carried away and lost by the draft through the stack.

It consists of a vertical furnace and main siaol adapted to receive the ore which is, 1o,

be roasted, a rneansfor closing said main stack, and side stack, through which the products of combustion may then pass, a chamber into which said stack opcns,l.iaving a supplemental stack leading from it fOlillG discharge of the products of combustion, and a means for settling and depositing the dust and fine partielse which may have been carried out by the draft upon the inclined bottom of this chamher, and delivering it thence automatically back into the furnace- Referring to the accompanying drawings for a more complete explanation of my invention, Figure l is a vertical section on the line m at of Fig. 2, and showing in section the furnace with its stacks and dust-chamber. Fig. 2 is a perspective View of the dust-chamber,

showing the relative position ofthc supple.

mental stacks leading into and fromit.

Aisavertical roasting-furnace, of the usual.

or any suitable construction,- having a feedopcning at B, whereby ore from thefeed-floor C may be delivered into the furnace, as desired, the said furnace having the usual tuyeres a, slag-discharge b, and bullion-discharg c. v

D is the main stack, which extends up verticallyfroni the furnace to any suitable height, and it is provided with a cover or damper E,

by which it may be closed whenever desired.

This cover is shown in the present case as suspended from a lever-arm lflfulcrunied to the side of the stack and operated by cord G, extending down to a pointwithin reach of the attendants.

i \Vhen a fire is made in the furnace, and 5 until the furnace is in condition for operation, the value or cover E may be opened, so as to allow a free draft through the main stack D; but when the Work is commenced the cover E is closed, so as to prevent any more draft through the stack D.

H is an inclined supplemental stack extending outward and upward from the side of the main stack 1), and its mouth opens into a chaniberl, situated at a suitable distance from the furnace and in such position that the stack H opens into it at or near the center.

- This chamber may be of any suitable size. I

have here shown it as being about ten feet square on the top, having the front upward spout L, the opposite end of which discharges into the furnace A. This feed-spout L may be about two and one-half feet Wide by four inches deep where it opens out of the dustchamber, and about two inches deep whereit delivers into thefu-rnace, so as to prevent any especial draft through this passage.

The operation will then be as follows: Ore is fed into the furnace in quantities and at times pass through the inclined stack ll into the large chamber I, where the draft through the stack H will be so deadened and reduced that any dust which may have been carried up through this stacl; will be deposited upon the inclined floor J of the chamber 1, and this dust will, by gravitation, slide down the floor and through the dust-passage L, so as to be again delivered into thefurnace to a be properly roasted,

ofeleven feet in height and the rear Wall is the flue-dust feed-opening leading .into the.

At one cornerofthc to suit, and the cover E being closed upon the main stack the products of combustion will feed, it may be done by opening a gate in v .the passage P, which opens from the lower 'part of the passage L, and the dust will thus By placingthe stack K at a point out of line with the inclined supplemental stack H the continuity of draft through these two is broken and the dust is delivered into a comparatively quiet atmosphere in the chamber I, which allows it to be deposited,as above described.

If for any cause it is desired to stop the be delivered upon the feed-floor 0.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a verticalrnace j having the vertical stack with-a cover,--and means whereby it may be operated to close the vertical stack, of a supplemental inclined stack leading from the side of the vertical stack, chamber into which .said supple-. mental stack discharges, said chamber having an inclined bottom, as shown, and a fine lead-; ing from the bottom into the furnace, and a second vertical stack opening upwardly frond the top of the chamber, substantially as herein described. i 2. An ore-roasting furnace consisting of the vertical stack, the vertical flue with a cover, and mechanism whereby said cover may be made to open or close the vertical stack, a t

supplemental inclined stack leading outwardly and upwardly from the side of the main stack, a chamber of larger size, into which said stack discharges near the center,

and a vertic'al stack opening upwardly from the top of said chamber and out of line with the inclined stack, an inclined bottom within said chamber, and a correspondingly-inclined passage or chute extending from the lower part of said bottom into the furnace, said chute having its upper end of larger diameter than the discharge end, substantially as herein described.

3. In an ore-roasting furnace, the vertical [stack with a controlling cover, an inclined "stack-leading out from the main stack, a chamber of larger-size, into which said stack discharges, With a vertical stack opening upwardly from the top of said chamber, and'a passage or chute leading from. the bottom of the chamber to the furnace, in combination with the supplemental discharge P and gate 0, substantially as herein described.

In Witness whereof I have hereunto set my hand; 7

JOSEPH L. GIROUX. Witnesses:

STEPHEN CANAVAN, ROBERT McRoBER'rs. 

